High efficiency triple mode space traveling-wave tube

Techniques consistent with high efficiency over a wide dynamic power range were utilized in the design of this multi-mode traveling-wave tube. Design objectives included the achievement of high efficiency at all three RF output power levels. A modulation-anode type electron gun is utilized. Mode control is afforded by changing a single anode potential. The gun generates electron beams which are capable of supporting suitable beam-circuit wave interaction in all three power modes. The tube was designed for use on the MARISAT program which is aimed at providing UHF communication for the Navy along with L-band maritime communication for commercial shipping.